Thread: The art of quad throttles

I'm looking for links or information on how to calculate the requirements for Quad throttle body's.

I have a set of 45mm's off a black top 4AGE that i want to adapt onto a sr16 manifold / head but im not sure about positioning and measurements. I am limited a little by clearance between the head and the firewall

1) How close should the throttle plate be to the valve / port? Is shorter better?

2) How long do the trumpets need to be?

3) Are sock filters the better option or should i build an air box and panel filter arrangement?

I'm not looking for exact measurements as i realize it will be a little hit and miss.
What has worked for others?

What head specs / cam specs / other engine parameters need to be taken into account?

Cy

I am pretty sure the 45mm ITB's would be too small on a 2.0 VE. For a 1.6 you may be okay.

3) Sock filters really limit the power and negate the effort of going ITB in the first place.

One local sr20ve with big cams and 4age quads, Held power to 9K but what it made at 9K my stock intake n1 20ve made at 7800rpm

^^^ was he using the black top 45mm ones or silver top 40mm ? any pics?

45mm ones No pics, User posted up a thread on my forum details and video here

NeoVVL Forums :: View topic - My N14 with SR20VE Race car

Got the details from my tuner because he tuned the car

Rather try and source some M3 or 330i BMW ITB's. 50mm.

I find it hard to believe that 4 x 45mm throttle body's could be restrictive compared to 1 x 70 mm one.... Phil at Kelfords reckoned 45's were ideal when i was asking him about them.

Remember that the cylinders aren't drawing air through that single throttle body simultaneously. Also of note is that the cross-sectional area of a 45mm TB is 0.00636m2, and the area of a 70mm TB is 0.01539m2 - which is approx. 2.4 times the area of the 45mm TB.



PS: Hello!

****ing exactly!

42-45 is fine for these motors.

BTCC only ran 46mm tapered throttles.

what power are u lookin to make and for what?